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Class A fire ratings indicate a flame spread rating somewhere between zero and 25. Materials that fall into Class A or Class 1 include things like brick, gypsum wallboard, and fiber cement exterior materials. These materials do not burn well and are very unlikely to contribute fuel to a fire.
The Class A fire rating is the most stringent standard available for building materials. It’s usually assigned to retardants that have a flame spread rating of between 0 and 25 during fire tests. Any material with this rating typically has a lower flame spread and a better performance rating than Class B or Class C material.
Discover how ASTM Class A Fire Rating and IBC, NFPA standards ensure maximum fire resistance. Learn about TWS solutions and the importance of these ratings.
What Is a Class A Fire Rating? The Class A, also known as Class 1, fire rating describes the highest quality of fire-resistant building materials. This class has a flame spread index of 25 or lower, which measures a material’s likelihood of spreading flames.
What is a Class A fire rating? Class A (or Class 1) is the best fire rating. The flame spread for a Class A fire rating is 25 or lower, and the smoke development does not exceed a maximum of 450. Many facilities require a Class A rating for building materials. For example, hospitals typically require Class A ratings.
As mentioned above, our RealWall, LiteBarrier, and FireblockWall containment systems, including the modular ceilings, have a Class A rating per ASTM E84, meaning they have the lowest fire spread rate and minimal smoke production.
The five classes of fire are: Class A Fire: Ordinary Combustible. Class B Fire: Flammable Liquids and Gases. Class C Fire: Electrical Equipment. Class D Fire: Combustible Metals. Class K Fire: Cooking Oils and Fats. Class A Fires: Ordinary Combustibles. Ordinary combustibles are the sorts of materials that you will often find around the house.